avoiding some tax

[greg]

hello ,i am an expat but interested at maybe forming a company or sole trading with 2 small flats in uk,which would be the best way of avoiding tax as i already know i am eligable for 20% tax at source if i am registered overseas,they would bring in some income but not much probally 800 a month.i also have a 17 year old son in uk would it be viable to buy in his name.